Image copyright EPA Image caption An Iranian man in Tehran lights up a sparkler to celebrate the anniversary of the embassy takeover
Iranians gathered in the capital Tehran to mark the anniversary of the 1979 US embassy takeover by chanting “Death to America” and setting off fireworks.
At least 52 Americans were held hostage for 444 days during the era of the hardline conservative regime, which was toppled in the Islamic Revolution of 1979.
Opposition politicians say a date for a possible Trump visit is being prepared.
The US president has condemned Tehran’s involvement in regional conflicts.
Iran sees the US as a threat to its stability and security.
On Thursday, Iranian Foreign Minister Mohammad Javad Zarif responded to a query about a planned US state visit by saying: “A continuation of the Islamic Republic’s approach toward the US with continuing sanctions and hostility – like our leader Hassan Rouhani and President Rouhani said at that [recent] Saudi Arabia-hosted meeting of Muslim countries – is acceptable.”
Another sign of the occasion was when protesters burnt pictures of US President Donald Trump and his Secretary of State Mike Pompeo on Friday.
Images on social media showed protesters burning both men’s pictures.